205 results about "Colorimetric sensor" patented technology

A system for determining the level of an analyte in a physiological fluid of a live individual is described. A wearable sensor periodically obtains data representative of the level of the analyte and has a passive RFID tag that stores the data. A receiver wirelessly interrogates the sensor with an RF interrogation signal. The RFID tag modulates or otherwise modifies the wireless interrogation signal using the data and the receiver receives back the modulated or otherwise modified interrogation signal and extracts the data from it. The receiver then determines, from the data, the level of the analyte in the fluid. The sensor may be a photometric or colorimetric sensor or an electrochemical sensor. The receiver may be, or be incorporated into, a hand-held device, a portable device, a PDA, a mobile telephone, or a laptop computer. The resulting system is more versatile and consumes less power than conventional systems.

Colorimetric sensor films comprising a reflective layer, a polymeric detection layer, and a semi-reflective layer are disclosed. Devices comprising the colorimetric sensor films and methods of making the films and devices are also disclosed.

A colorimetric reagent in the form of nanoparticles, composite nanoparticles, and nanoparticle coatings, including methods of use, methods of preparation, deposition, and assembly of related devices and specific applications. The colorimetric reagent comprises cerium oxide nanoparticles which are used in solution or immobilized on a solid support, either alone or in conjunction with oxidase enzymes, to form an active colorimetric component that reacts with an analyte to form a colored complex. The rate of color change and the intensity of the color are proportional to the amount of analyte present in the sample. Also described is the use of ceria and doped ceria nanoparticles as an oxygen storage/delivery vehicle for oxidase enzymes and applications in biocatalytic processes in anaerobic conditions of interest in biomedicine and bioanalysis. Further described are a variety of related applications of the disclosed technology including clinical diagnosis, in vivo implantable devices, food safety, and fermentation control.

The invention discloses a bicolor Eu-MOFs/CDs fluorescent material as well as preparation and an application thereof. Europium ions, trimesic acid and carbon quantum dots are used as raw materials, and the bicolor fluorescent material is prepared through heat treatment in a solvent prepared by mixing N,N-dimethylformamide, distilled water and cyclohexanol. Under irradiation of ultraviolet lamps, the material can emit red fluorescence when dispersed in organic solvents and can emit blue fluorescent when dispersed in water, so that fluorescent colorimetric sensors for measuring water content in organic solvents can be prepared from the material, the prepared sensors are high in sensitivity, good in stability and low in cost and have higher population value and brighter application prospect.

Colorimetric sensors comprising a reflective surface and a curable layer are disclosed. Devices comprising the colorimetric sensors and methods of making the sensors and devices are also disclosed. Methods of using the sensors and devices in numerous applications are also disclosed.

An optical module (colorimetry sensor) includes an interference filter, and a transparent substrate to which a first substrate of the interference filter is fixed, having a second thermal expansion coefficient which has a value different from a first thermal expansion coefficient. The interference filter is fixed to the transparent substrate through an adhesive layer made of gel-like resin, and the adhesive layer alleviates stress generated due to a difference in the thermal expansion coefficients between the interference filter and the transparent substrate.

In some embodiments, a wound dressing that incorporates a number of sensors or sensors separate from the wound dressing can be utilized in order to monitor characteristics of a wound as it heals or to identify one or more risk factors or conditions that may precipitate a wound. In some implementations, a wound dressing configured to be positioned in contact with a wound includes a substantially flexible substrate supporting one or more sensors. The one or more sensors can include temperature sensors, conductivity sensors, multispectral optical measurements sensors, pH sensors, pressure sensors, colorimetric sensors, optical sensors, ultraviolet (UV) sensors, or infrared (IR) sensors.

Described herein is a substrate comprising at least one colorimetric component attached to a peptide, as well as methods for detecting a modification of said substrate. Also described are methods of detecting the presence or absence of a protein, for example, a protein produced by a microorganism, by contacting a substrate with a sample. If the sample contains the protein of interest, the substrate is modified and a visible color change results, indicating the presence or absence of the protein in the sample. The present invention also features biosensors and kits for detecting the presence or absence of microorganisms and/or proteins in a sample.

There is provided a polydiacetylene supramolecule comprising diacetylene molecules, capable of immobilizing a receptor molecule having a thiol group. Since the polydiacetylene supramolecule has a receptor immobilized thereon having a thiol group, for example, an antibody, and thus shows color transition when reacting with a sample, an antigen can be detected through specific color transition of the polydiacetylene when employing in a receptor-ligand reaction, for example, an antibody-antigen reaction.

A colorimetric array includes a substrate, a first spot on the substrate, and a second spot on the substrate. The first spot includes a first nanoporous pigment that includes a first nanoporous material and a first immobilized, chemoresponsive colorant. The second spot includes a second nanoporous pigment that includes a second nanoporous material and a second immobilized, chemoresponsive colorant. The first nanoporous pigment is different from the second nanoporous pigment.

Quantitative colorimetric carbon dioxide measurement and measurement systems and methods are disclosed. The methods can include methods for calibrating a chemical colorimetric indicator used in the quantitative colorimetric carbon dioxide measurement system. Apparatuses are disclosed including a cartridge comprising a chemical colorimetric indicator that is configured to removably engage with a quantitative colorimetric measurement system. Cartridges containing a sealed container comprising a reference gas with a known concentration of carbon dioxide are also disclosed. Systems and methods for humidifying the chemical colorimetric indicator are also provided. Methods for using the systems are also disclosed including providing a breathing therapy to a patient or user.

Colorimetric sensors comprising a receptor incorporated within polydiacetylene assemblies to form a transducer capable of indicating a color change when contacted with an analyte are disclosed. Methods of using the colorimetric sensor and a kit for the colorimetric detection of an analyte are also disclosed.

The invention relates to preparation and application of an aptamer colorimetric sensor for polychlorinated biphenyl 77 detection. An aptamer with a certain base sequence and specific PCB (polychlorinated biphenyl) 77 recognition capability and the colorimetric analysis technology are combined for constructing the PCB 77 aptamer colorimetric sensor. Due to adoption of the specific PCB 77 recognition aptamer as a recognition element, sensitivity and selectivity of the colorimetric sensor in PCB 77 detection are greatly improved. A PCB 77 detection linear range is 5*10<-10>-9*10<-7>mol/L, and a detection limit reaches 5*10<-11>mol/L. Compared with the prior art, the method has advantages of simplicity and convenience in operation, quickness in response, easiness in online detection and the like.

A digital still camera has a CCD image sensor, and picks up an image to produce an image signal. Colorimetric sensors have a sensor outer surface oriented in a measuring direction being different from a direction of an optical axis of the CCD image sensor, and colorimetrically measure ambient light. Lighting color temperature of the ambient light is determined according to a result of colorimetry. Image color temperature of the image is retrieved according to the image signal. A gain for each of color components is determined according to the lighting color temperature and the image color temperature. The color components of the image signal are amplified with the gain, to adjust white balance. Also, a camera body accommodates the CCD image sensor and the colorimetric sensors. The sensor outer surface is positioned on at least one of an upper surface and a lateral surface of the camera body.

A urine test for diagnosing lung cancer has been developed that uses an artificial nose such as a colorimetric sensor arrays to identify metabolic profiles in urine headspace gas. Cancer cells excrete unique compounds that are a byproduct of their metabolism. The compounds are excreted through a patient's endocrine system by filtration through the kidneys and other organs and are ultimately excreted through the urine. Some of these cancer cell by-products excrete in the urine are small volatile organic compounds (VOCs). Once the urine has exited the body, these VOCs may be outgassed to the environment. Experimental research has determined that a colorimetric sensor array as disclosed is capable of reliably identifying patients with lung cancer based after exposure to the VOCs of the urine headspace gas.

A Sorbent media exhaustion indicator produces color change when the sorbent media is saturated. The indicator's fluid inlet attach to the fluid outlet of a sorbent media device such as filter. It includes is a hollow tube or a hollow polyhedron prism that fluids flow freely through it. The indicator also includes colorimetric sensor that changes color when exposed to trace amount of toxic fluids and a trap member that prevent toxic fluids exist in the surrounding environment from changing the color of the colorimetric sensor, hence preventing false indication of sorbent media exhaustion. Another function of the trap member is to trap toxic fluids from exiting to the surrounding environment when toxic fluids breakthrough the sorbent media device.

The invention relates to a colorimetric sensor for detecting mercury ions. A preparation method for the colorimetric sensor comprises the following steps: hybridization of probes; signal amplification; and colorimetric detection. The colorimetric sensor prepared in the invention realizes highly-specific detection of target mercury ions; and in virtue of nucleic acid tool enzyme, signal amplification effect is exerted.

The invention provides a visual colorimetric sensor for detecting mercury ions. An H-DNA (Hinge-Deoxyribonucleic Acid) with a special hairpin structure is designed; in the presence of the mercury ions, a 3' end and a 5' end of the H-DNA are complementary and paired through a T-Hg<2+>-T structure, so that a stem part of the H-DNA is completely complementary and exonuclease III is triggered to shearthe stem part, and then more and more single-stranded DNAs containing rich guanine are generated; released Hg<2+> also reacts with the H-DNA to trigger enzyme digestion reaction; the cycle is carriedout so that the H-DNA is continuously sheared and more and more single-stranded DNAs containing G are generated; in the presence of hematin chloride, a DNA catalyzing enzyme is formed, and 3,3',5,5'-tetramethylbenzidine is catalyzed to react with H2O2, so that a blue product is generated and the mercury ions are visibly detected. The method provided by the invention is simple to operate, low in cost and short in time, can be used for rapidly and visibly detecting the content of the mercury ions in an environment water sample and is hopefully applied to detection of mercury in the environmentwater sample.

The present invention provides, inter alia, a device comprising a colorimetric detection layer configured to undergo a color change upon interaction with a first analyte of interest. The detection layer comprises a first plurality of self-assembled fiber bundles. At least a fraction of the fiber bundles undergo a change from a first conformation to a second conformation upon interaction with the first analyte of interest, thereby undergoing a color change. The invention also provides a method for using the system to detect an analyte of interest.

The invention relates to the technical field of tea quality monitoring, in particular to a method for monitoring the fermentation degree of black tea through a hyperspectral coupled nanocrystallization colorimetric sensor. Volatile substances in the fermentation process of black tea are captured by utilizing a nanocrystallization colorimetric sensing array, colorimetric array feature information is efficiently extracted by combining a hyperspectral image technology with dimension reduction algorithms such as principal component analysis and linear discriminant analysis, and an information fusion discrimination model with strong robustness and high accuracy is established by adopting algorithms such as partial least squares discrimination, multivariate linear discrimination, a support vector machine, an extreme learning machine, an artificial neural network and a deep belief network to realize rapid and accurate discrimination of the fermentation degree of black tea. The method has the characteristics that the analysis speed is high, the sensitivity is high, the cost is low, a sample does not need to be pretreated, and online nondestructive detection is facilitated.